The intersection of psychology and neuroscience has revolutionized our understanding of consumer behavior, offering profound insights into the cognitive and emotional processes that drive decision-making. This research explores the multifaceted impacts of psychological theories and neuroscientific advancements on consumer behavior, emphasizing how factors such as perception, memory, emotions, and neural mechanisms shape purchasing decisions. By integrating behavioral economics, cognitive neuroscience, and social psychology, the study highlights the role of implicit biases, heuristics, and neurochemical responses in influencing consumer preferences. Furthermore, the research examines the implications of neuromarketing techniques, such as brain imaging and biometric analysis, in predicting and shaping consumer behavior. Ethical considerations, including privacy concerns and the potential manipulation of consumer choices, are critically addressed to ensure responsible applications of these insights. By synthesizing theoretical models with empirical evidence, this study provides a comprehensive framework for leveraging psychology and neuroscience to enhance marketing strategies, improve consumer satisfaction, and foster ethical business practices.